Tool-rest



(No Model.)

0. E. POLLARD. T001 Rest.

Nb. 241,880. Pat nted May 24,1881

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UNITED STATES PATENT OFFICE.

CHARLES E. POLLARD, F OHIOOPEE, MASSACHUSETTS.

TOOL- REST.

SPECIFICATION forming part of Letters Patent N0. 241,880, dated May 24, 1881.

Application filed December 27, 1880.

To all whom it may concern Be it known that I, CHARLES E. POLLARD, of Ghicopee, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Tool Posts for Lathes; and I do hereby declare that the followingis a full, clear,-and exact description thereof, whereby a person skilled in the art can make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Like letters in the figures indicate the same parts.

My invention relates to a support for the tool used in metal-turning lathes, which can be adjusted so as to slightly vary the height, when required, to bring the point of the tool into the proper position for cutting the object turned.

The object of my invention is to providean adjustable tool-rest of a simpler and firmer construction than has heretofore been in use.

In the aocompanyin g drawings, illustrating my invention, Figure 1 is a side view of the base of my improved tool-rest, being that part which moves upon ways back and forth upon the slide rest or carriage for the tool mechanism, and to which it is clamped when in use. Fig. 2 is a vertical section through the middle of the adjustable tool-rest from front to rear. Fig. 3 is a cross-section through the middle on a vertical plane at right angles to that shown in Fig. 2.

A is the base-block of my improved adj ustable .rest. It is furnished with a dovetailgroove on its under side, upon which it slides back and forth in the usual manner. It has a cylindrical well, reaching from the top nearly through to the bottom,for the reception of the part which carries the tool. This is shown at A in the drawings.

B is the movable part, which carries the tool. It has a slotted top for the tool-clamp, by which the tool is held in the customary manner. Below this it is of a cylindrical form, fitting into the well in the base A. The lower end of this cylindrical stem is grooved in an inclined direction from side to side, a longitudinal view of the groove being shown in Fig. 3, and a cross-section in Fig. 2.

O is a sliding inclined or wedge-shaped block, which fits into the groove in the bottom of B. Its top part is furnished with projections or flanges O, which fit into correspondin g channels, B, in the part B. The bottom of (No model.)

the sliding-block O is intended to rest upon the bottom of the well in A to give a firm support to it.

D is a screw, passing through a nut or hollow thread in the block 0, for the purpose of moving it back and forth with a positive motion. This screw has a projecting head, D, outside of the base A, for the purpose of turning it, and it is held from moving endwise by a collar under the head and a nut or set-screw at the other end. These rest against the sides of the base A and allow the screw to turn without moving endwise. Whenever the screw is turned so as to move the block 0 to the right, as shown in Fig. 3, part B is forced upward, and when G is moved to the left the part B is forced downward. In this way the tool-rest can be set to the exact height required by turning the head D.

' F is a slot cut through one side of the base A. This slot is for the purpose of forming a clamp to hold the part B firmly when required.

G is a bolt, furnished with a screw-thread for drawing together the sides of the slot F. It is furnished with the projecting head G for turuiugit. When this screw is turned out ward, as shown in Fig. l, the part B can move freely up and down in the part A. When, however, the screw Gris turned in, so as to draw the sides of the slot F together, the part B is held firmly in its position, and thus affords a secure rest for the turning-tool which it carries. The block (3 and the screw D hold the' part B from turning; but if greater strength is desired in this direction, a spline and feather of the ordinary construction can be introduced between the parts A and B, which will permit only a vertical motion and relieve the screw from the strain.

What I claim as my invention is 1. The combination of the base A, provided with a cylindrical cell for the tool-carrier, the vertically-moving tool-carrier B, the sliding block 0, arranged within said base, and the screw D,substantially as described.

2. In an adjustable tool-rest, the combination of the part B with its cylindrical stem, the base A with its circular well and slot F, and the clamping-bolt G, substantially as described.

CHARLES E. POLLARD.

Witnesses:

THEO. G. ELLIS, WILMOT HORTON. 

